<l!)8 PELECYPODA. [EulameHibranchia. 



centrically lamellate, light brown. Beaks contiguous, not raised, 

 flattish, incurved and directed forwards. Anterior end short, occu- 

 pying about a quarter of the length, attenuated and very narrowly 

 rounded, dorsal margin straight, slowly descending ; posterior end 

 truncated, the dorsal margin long, straight, almost horizontal ; 

 ventral margin very broadly rounded. Lunule fairly distinct, lanceo- 

 late, not much impressed. Escutcheon long, narrow, deep, distinct 

 only on the left valve. Sculpture consisting of very fine and elegantly 

 granular radiate stria? and rather distant unequal lamellae, obtuse in 

 front, crenulated, behind finer and broader, minutely crisped. Colour 

 light yellowish-brown. Interior white, the posterior end sometimes 

 purple. Margins finely crenulated. Hinge narrow, each valve with 

 3 diverging cardinals, the anterior right and posterior left entire and 

 slender, the others stout and grooved. Ligament rather short, ex- 

 ternal. Adductor -scars subequal, not deep. Pallial sinus moderate, 

 triangular, free and ascending, poirrted in front. 



Length, 38 mm. ; height, 20 mm. ; diameter, 19 mm. 



Type in the British Museum. 



Hob, Northern part of the North Island : Auckland Harbour ; 

 Whangarei Heads. &c. Boring in soft rock. 



2. Venerupis reflexa, Gray, 1843. Plate 62, fig. 7. 



Venerupis reflexa, Gray, Dieff. N.Z., 250 ; C.M.M., 73 ; Grit. List, 46 ; 

 Ereb. & Ten, 6, pi. 2, f. 3 ; Button, J. de Conch., xxvi, 50; M.N.Z.M., 

 152 ; P.L.8. N.S.W., ix, 524 ; Index, 90. F. paupercula, Deshayes, 

 P.Z.S., 1853 (1854), 5 ; M.N.Z.M., 152. 



Shell ovate to oblong, very irregular, somewhat inflated, fairly 

 solid, inequilateral, irregularly concentrically laminated, yellowish- 

 white. Beaks approximate, tumid, incurved and bent forwards. 

 Anterior end short, rounded, the short dorsal margin lightly excavated, 

 descending ; posterior end truncated or broadly rounded, dorsal 

 margin straight, very little oblique ; basal margin moderately arcuate. 

 There is neither lunule nor escutcheon. Sculpture consisting of thin, 

 sharp-edged, reflexed, concentric ridges, sometimes very irregularly 

 arranged, highest and most bent over and back at the hinder edge, 

 the interspaces with 2 or 3 lower concentric ridges and faint radiate 

 strife. Colour dirtv-yellowish or brownish-white. Interior vellowish- 



.' */ v 



white, frequently marked with violet behind. Margins smooth. 

 Hinge narrow, each valve with 3 cardinals ; in the right valve the 

 anterior and posterior tooth are small, the median tooth large, tri- 

 angular, grooved ; in the left valve the posterior cardinal is entire 

 and thin, the others stouter and grooved. Ligament short, rather 

 thick. Adductor -scars large, not much impressed, the anterior scar 

 oval, the posterior roundish and slightly larger. Pallial shins free, 

 nearly horizontal, broad and deep, rounded in front. 



Length, 28 mm. : height, 21 mm. ; diameter, 17 mm. 



